Burglar alarm



Mar. 27, 1923- S 1,450,132 J. J. BREST 'BURGLAR ALARM Fild Mar. 15, 1921 2 sheets-sheet 1.

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' J. J. BREST BURGLAR ALARM Filed Mar. 15, 1921 2 sheets-sheet 2 iaililllllmla '7LI'IIIIIII IIVVENTOR W Br A TTOHNEVS WITNESSES MM/%ZM TM J1.

Patented Mar. 27, 1923.

JACOB J. BREST, OF NEW YORK, N. Y.

- BUFRGLAR ALARM.

Application filed March 15, 1921. Serial No. 452,458.

To all whom it may concern.

Be it known thatl, JACOB J. Bnns'r, a citizen of the republic of Russia, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Burglar Alarm, of which the following is a full, clear, and exact description.

This invention relates to a burglar alarm, and has particular reference to a signalling means operated by the movement of a door by unauthorized persons.

An object of the invention is to provide a simple, compact and strong alarm device which can be readily attached adjacent any type of door and which will be operated, after having once been set, whenever any person moves the door.

Another object comprises a device in which the movement of the door by unauthorized persons explodes a cartridge or similar device to produce a signalling and, at'the same time, to operate an electrical circuit to ring a bell, illuminate a light or 'to perform some other electrical indicating function.

A further object resides in the provision of means whereby the explosive signal charge maybe readily removed and replaced at will. v v

A still further object resides in the particular construction and arrangement of parts which are hereinafter described and claimed and shown in the accompanying drawings.

The invention in general comprises a casing so constructed as to be adapted to recelve the lock of a door of any type when the door is in its closed position. This casing is constructed to contain a signal comrisin' an ex losive char e referabl inp D 7 the form of a cartridge, adjacent which is located a trigger mechanism. This trigger mechanism is normally inactive but by means of a device located adjacent the door bolt'the trigger can be actuated to explode the charge. This means for actuating the triggeris'disposed in the'path of movement of the bolt whenever the door, after having once been locked for the night, is moved by some unauthorized person without withdrawing the bolt from the casing. This will happen whenever anyone is attempting to jimmy the door. An electrical circuit closing means is disposed within the casing in thenormal path of the bolt and is so constructed that whenever the bolt projects into the casing in its normal manner the circuit closing means is opened, but whenever the bolt is moved in one direction or another from normal position the circuit closing means will close the circuit and cause an electrical signal to be put into operation.

Another feature resides in the provision of means which, whenever the bolt is moved by some unauthorized person as above mentioncd, protecting barrier or plate will interpose itself automatically back of the bolt and between the bolt and the circuit closing means so that any attempt to move the door and bolt back to its closed position will be prevented by this barrier. This prevents the door from being closed after once having been opened, and provides means at the same time for permitting the electrical signal to ring until the circuit is opened by someone, and, moreover, prevents the circuit closing device from being damaged by undue contact with the bolt.

The invention is illustrated in the drawings, of which- Figure 1 is a horizontal section taken through the door, the door j amb and the sig nal casing;

Figure 2 is a side view of the casing with a portion thereof removed to show the interior operating parts;

Figure 3 is a section taken on the line 33 of Figure 1; b

Figure 4: is a section taken on the line 4ei of Figure 2; Y

Figure 5 is a section taken on the line 5-5 of Figure 2;

Figure 6 is a section taken on the line 6-6 of Figure 2;

Figure 7 is a partial section showing the circuit closing means and the barrier plate in the normal position when the bolt is not within the casing; and V Figure 8 is a partial section showing the explosive charge barrel or carrier removed to a position to remove and" replace the charge.

The preferred form of my invention, as illustrated in the drawing, is shownzin. the

form of'a casing l which is adapted to be applied to a door jamb 2 adjacent a door 3' on which any suitable form of lock casing 4 is disposed. The usual bolt 5 (see Fig. 5) is adapted to project from the lock casing 4. When the door 3 is in its closed position, the bolt 5 is adapted to project through an aperture 6 in the signal casing 1 provided therein. The casing 1' may be attached to the door jamb by any suitable means such as screws 7 Within the casing 1 are disposed an explosive charge barrel or carrier 8 and a circuit closing means or switch 9. Adjacent the barrel 8 is located a trigger 10 which is actuated by a boltoperatedlever or pawl 11.

The explosive carrier or barrel 8 is rotatably mounted on a shaft 12 which is suitably journaled within the casing 1 and is provided with doors adapted to receive explosive charges in the form of cartridges 13. There may be a pair of cartridges 13 mounted in the barrel 8. One end of the shaft 12 extends through the casing 1 and is attached to a handle-operating portion 14. Through this handle projects a latch shaft 15 operated by a finger portion 16 and normally held inward by a spring 17 The end. of this latch shaft 15 is adapted to engage in a suitable number of recesses in the face of the casing to hold the barrel 8 in any desired position. Normally the barrel is so disposed as to range the artridges 13 in line with an opening in the end of the casing 1, as shown in Figures 3v and 6. When the charges have been exploded, the handle portion 14 is moved to reverse the position of the cartridges 13, as shown in Figure 8, whereby the cartridges 13 can be removed from the barrel 8. In the bottom of the casing 1 a recess 19.

is provided through which a handle portion 20 projects. This handle portion is pivoted at 21 within the casing in any suitable manner and is provided with projecting finger portions 22 adapted to lie adjacent the rear ends of the cartridges 13, and when moved engage projecting lugs 23 disposed on the side of each of the triggers 10. These lugs are disposed on the lower lateral edge of the triggers 10 which are pivoted as at 24. These triggers 10 are pivoted, as above mentioned, on a shaft 24 journaled at one end in the casing 1 and at the other end in a plate 25. This plate 25 is spaced from one side of the casing 1 and forms a support for strong springs 26. One end of each spring is adapted to bear against the projecting lug 23 of the triggers 10. The other ends of the springs 26 are adapted to bear against a stub shaft 27 j ournaled between the casing 1 and the plate 25. The middle portion of the spring is wrapped, as shown at 28. around a stub shaft 29, similarly disposed between the plates 25 and the casing 1. The normal position of the triggers 10 is, as shown in Fig. 2, with handle portions such as 30 bearing against the rear ends of the cartridges Whenever the trigger is moved to the position shown in dotted lines in Fig. 2 and thensuddenly released, the springs 26 will force the hammers 3O forcibly against the priming cap of the cartridges 13 and explode the charge. This forcible movement of the triggers is effected by the following means.

The actuating lever or pawl 11 is pivoted at 31 and normally held in the position shownin Fig. 2 by a spring 32 extending from the pawl and the casing 1. The lower end 33 of this pawl plate at one side thereof is disposed normally adjacent the upper end 34 of each trigger. On the other face of the lower end of this pawl plate 11 is disposed a laterally projecting arm 35 which projects therefrom in the direction of the bolt 5. The normal position of the bolt 5 is shown in Fig. 2. /Vhen the owner of the house, or other building to be protected, is looking the house up for the night he looks the door and the bolt is then disposed in the position shown in Fig. 2. Thereafter any attempt to move the door without withdrawing the bolt 5 from the casing 1 will cause a m0vement of the bolt to the right, as shown in Fig. 3, and this movement will bring the bolt in contact with the laterally projecting arm 35 on the operating or tripping pawl plate 11. This movement will cause the pawl plate to move the upper end of the triggers to the dotted position shown in Flg. 2. However, a

further movement of the pawl plate 11 will cause this plate to pass beyond the upper end of the triggers which, therefore, will be released. Upon being released the triggers, under the action of the springs 26, will be forced strongly forward to explode the cartridges in the manner above described.

Disposed in the casing 1, in the upper end thereof, adjacent the opening or aperture 6 and in line with the normal path of movement of the bolt 5 as it progresses from the lock casing 4, is a pivoted circuit-closing device or switch 9 which is pivoted at 36 on the casing 1. The upper end of this pivoted switch 37 is in the form. of a head, the lower end of which is in the form of a hooked arm- 38. This switch normally is held in the position shown'in Fig. 7 by a spring 39 pivoted. at 40, one end 41 of which-bears against the rear portion of the head 37 of the switch. The hooked arm 38 is adapted in this normal position to make contact with a circuit ter-- niinal 42 to which a wire 43 is connected.

The pivot point 36 of the switch is connected to a wire 44. These wires 43 and 44 are in circuit with a manually operated switch'45, a signal 46, and a. source of current such as a battery 47.

As shown in 7 there is disposed and pivoted on the casing lat 48 a barrier plate 49. This barrier plate normally hangs in the position shown in 'Fig. 7, with its lower end disposed on the side of the head 37 adjacent the laterally projecting arm 35 of the tripping pawl. This barrier plate 49 is so closely disposed adjacent the head 37 as to be also in line with the bolt 5. When the bolt projects into the casing 1, both the head 37 and the barrier plate 49 are moved to the right, as shown in Fig. 5. In this position the lower hooked end 38 of the switch 9 is removed from the circuit terminal 42 thereby opening the circuit, which may otherwise be closed.

Whenever the bolt 5 is withdrawn in the ordinary manner or is moved laterally to the right as viewed in Fig. 2 without being withdrawn from the casing, it will be seen that when the bolt has advanced in this lat eral movement a certain distance both the switch 9 and the barrier plate 49 will be released and permitted to move back into their normal position, shown in Fig. 7. In this instance, the switch 9 will close the elec trical circuit above mentioned and cause the electrial alarm device 46 to be actuated. At the same time, the barrier plate 49 is 'dis posed on the side of the head 37 adjacent the bolt in its removed position and an attempt to move the door and bolt back to normal will be prevented by this interposition of the barrier plate 49. This keeps the door open and prevents the switch 9 from either being broken or opened, so that the electrical signal will continue to operate until someone opens the switch 45.

It will thus be seen that I have devised a simple, compact and strong casing which can be attached to any door jamb and will operate to function in connection with any type of lock casing without altering in any material way either the lock casing or the door or door jamb. This device is capable of producing two simultaneous effective signals. The explosive device, after having once been discharged, can very readily be replaced by a simple manipulation of the parts as above described.

It will be understood, of course, that minor modifications in the structure and arrangement of this device can be efiected without departing from the spirit of the invention.

\Vhat I claim is:

1. A burglar alarm for doors adapted to be operated by the door. bolt, which comprises a casing adapted to be disposed on the door jamb and having an aperture adapted to receive the bolt of the door when the door is closed, an explosive signal device within the casing, a trigger adapted to actuate said signal device, and means in the path of the bolt, when moved within the casing without being withdrawn therefrom, to actuate the trigger.

2. A burglar alarm comprising a casing adapted to be disposed on the door j amb and having an aperture disposed in line to receive the door bolt, said alarm comprising a cartridgebarrel disposed within the easing, a spring-pressed trigger adjacent the barrel and adapted to explode the cartridge, and an actuating pawl disposed adjacent the trigger, a portion of the pawl lying in the path of movement of the bolt when it is moved within the casing without being withdrawn therefrom.

3. A burglar alarm comprising a casing adapted to be attached to a door jamb having an aperture disposed to receive a door bolt, said alarm comprising explosive means for signaling disposed within the casing, means for discharging said explosive means, and a tripping device for actuating the discharging means, said tripping device being in the line of travel of the bolt when moved laterally within the casing.

4. A burglar alarm which comprises a casing attached to the jamb of a door, said casing having an aperture therein into which the bolt of a lock on the door extends, and a pivoted plate on said casing held in an abnormal position by the bolt when the bolt is introduced into the casing, said plate moving to a normal position back of the bolt after the bolt is moved to prevent the return of the bolt and the door to their original positions.

5. A burglar alarm which comprises a casing having an aperture into which the bolt of a lock is adapted to extend, and pivoted means disposed on the casing normally engaging the bolt to be held in an abnormal position, said means being released by the bolt when the bolt is moved from its normal position to be disposed back of the bolt and prevent the return thereof to the original position.

6. A burglar alarm comprising a casing disposed on a door jamb, said casing having an aperture into which the bolt of a lock on a door is adapted to extend, an explosive device Within the casing, means for exploding said device, said exploding means normally disposed in position adjacent the explosive device, resilient means to hold the exploding means in the position adjacent the explosive device, and means actuated by the movement of the bolt laterally within the casing to move the exploding means away from the explosive device against the action of the resilient means, and then to release the exploding means whereby the resilient means will cause the exploding means to strike the explosive device and discharge the same.

7. A burglar alarm which comprises a casing disposed on the jamb of a door, said casing having an aperture into which thebolt on a door lock extends, a cartridge barrel containing cartridges disposed on the casing,

a pivoted trigger normally lying adjacent by the bolt actuating the hammer against the barrel, :1- spring tending to hold the the action of the spring through a certain trigger in this position, a pivoted tripping portion of its movement and then releasing 10 lever normally engaging the upper end of the hammer to permit the spring to cause the trigger, said lever lying in the path of the hammer to strike the cartridge in the the bolt a spring holding the tripping lever barrel.

in a normal position, said lever when moved JACOB J. BREST. 

